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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13ea6223c6f5a0bde63a5c12531fc43aaf17272108fed6b9710be062cfe2ee9d' 
  AND token = '4Em4hcJBrrzga/NEBE6/Ambmi3qULcI8n7v04raRwpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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