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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a463d308757ef22e413738400ed4362e6946d0f26745ff62d56f0bb7b8a37ea9' 
  AND token = 'NpiRHY0SxT8oORsGvQaXicYP2FzoWf2yTKsKp8IDviM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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