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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21573adf1c7f288f928c0252a8fba0e960ffb3428104133768f6c6bccb0cf565' 
  AND token = '4a9gfE+fMooHE5AtPTFcFwaGPh3YT9qCH+lQTw1ooFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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