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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d35ba36f8b074d4a4be583d9f893f9f3b1730e78bc879f1b9fa6b774094ac83' 
  AND token = 'jnZ78Ow7Q58HbVqtvEQtS3loL2tIQxRDdFTV+ZlhirU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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