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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2747d244108436d7a6b1bd6c750c128607d3a3a95db2a2a1fcc1aff8df4f4481' 
  AND token = 'L6v6MvWX0G5dv1hwPzIf2UdyzDaadYT3wOrlYbjsvZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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