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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f83ed2b533124758a9c7f88d22650cc6bb604ee9814472b20010af516666cbf9' 
  AND token = 'Iliw/Z1saCtQLgQ0KclmZe2fxWiO4m+tDquI0l5PnP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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