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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a852bb462cf9f0cfd464e670c0e07f63db1ca10a85e0120ff3bf0f01baeb50be' 
  AND token = 'ZAvnk/O5yOPJMxUW49hCnzYfdPNBQXRZ9Iqkqp691wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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