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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa8db0d4b02555135e498afafc4e7e0e343fce5c581e6e814577ae58bd0a62a4' 
  AND token = 'hm1CzifhR5TiBKQf9hmMH/iHDpV8Z51kdn7q858F9FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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