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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfd6140e0852be23eacbfd49e6e35e800000bae17c82b029d438d3c0f69a7839' 
  AND token = 'BreXFBZ96w/c6a3bub0Kktg1ctpCF2stUiR6jm7AAMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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