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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e12b75573d27e9fc2cae77e4ee678ca578326b3932d9a0918086bc95f6dcac1f' 
  AND token = 'Oe/R+9GNs8ULKSASkjbanj6NitLtX02iAYV4NYypE30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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