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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '265ece7bb0d160894985497f03c3b1bbf60e2991f0da12112d048de0881da943' 
  AND token = 'Mlneus+fVdv7XB3FuvnVtxpsPYFsQXEj7bX+uyiumTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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