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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39b2fc4dc3e4c70c029158698785ec024b2e244c0dad8677a60d9ae86da48ef8' 
  AND token = 'CLRTIgka8HOwqKC9Estyp5jsES6+v94WI92kooWz/FA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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