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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06c97f51f0084dff90ad2b7de7e7d9c8524028e02e935bd4d84d804f65b75199' 
  AND token = 'cUtux7lHtdXcoTOdb9VRivUVpMGtamqPCEk6nIgW9N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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