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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a51ad33273fc38d812f363fc00229573daf143eae2ff62d168fd807d60cadd6e' 
  AND token = 'uwnf2JG6JkkcaezJH6QZUdyhu9MGeAsezPEwSjioq7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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