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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf87720894b6e9da02d54c231f6d9e321694a82a38fe74ea33528089ce585cda' 
  AND token = 'HryYOLLtKKDbzoZ5A2cXjpkJEx1inPHUzN1BlPOGMUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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