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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0de7be79332f3959b923483c4009fd725182a1df3fe17e47cb1505368b054051' 
  AND token = 'yg4tWktuVSjtNbePfiII20jm5JG1ZX1GT6mh0hLgoFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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