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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c81e556f347e9db6abbcb99831c4843e84c2615ecb189ed08efaec6d4240549' 
  AND token = 'SlyhP7R7yEMi8SjkiUYmVoJYS2I7cGVM0KRzuGItNmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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