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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b6e51ad7e7d631c201adf5a224ffe36f3a5cf4aae3f4420bea8b7f777595488' 
  AND token = 'hhQUWsfxh3foHRiBYYn1lwEB2arTUojRTQiy+1bVk2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00939

JSON explain

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