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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c389082712c206f4393bbb9002a659ae5b5cd615489cc64df4d7e12973121902' 
  AND token = 'OnV7Eep1mt2ps9fm45c7Klf5C2YOvq3iy76tSltQTyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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