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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaee77f9b02aa573d93000bac5dc8f51a03c64ef7c65ab2ad89278a66f6046d8' 
  AND token = 'atVRzT4zFMpxqucP+wnGrsHz3ImEj94caULl5zE+bBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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