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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f31237b11ab123b3663180ed46923908ff7f4610ade1eaf0fe30f7d8e3ad25ba' 
  AND token = 'goCyTcvybiftOyr1RkbV48UCnk3Xix5Lz17LTQ5d2j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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