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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfc17d0c2cda710d612f6aa94f0fbb4207cc084a72f348820c3c524743f25ef9' 
  AND token = '7C+UR9z9yP2MsjfDaa4XbUdpRdY8cU+kfM9R77wnaOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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