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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b227d783a61a76bc842821afd9e1aec642e6c1625b3cd98e3c33df9a3d156ebb' 
  AND token = 'xHZu6y4/ChwXP1Lw2R7eyjdZSJ07xYCLbl7sI3Qb1+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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