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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2ac8cab08d9bba71ab0374eea83cd0570dd92e1d9961c3a3fb53e048f01cd87' 
  AND token = 'OxXzFzj2IiMFw6lolqwv6q6MWMKE3NdKr67pZITC2YE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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