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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18cf63458fa35206e30f25e1c2cbf7d5ad9edb75343f4c62e737fda3af189a92' 
  AND token = 'OXyEXYVbc0MQWpzr5VSGmFiUxbqqVgG7u33G+mEwX34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}