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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bfd4084fc517e5c7e2902881d3af0eb68ccdff8e7508407f0e46b96a0ce486a' 
  AND token = 'La5FP9JAlczeJ6fHEXJUJQvYvJyjZLKcZgDmCb7I6GM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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