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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44830a7436d9cd85560577477fdc8b9bc3e031c4d6c6e003f45b3c0d13218a3d' 
  AND token = 'jm1KE1EFVNnE+wrxLVEjsvFx2iIe9oqB6YOe6QpsgO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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