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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ea1fd969062163aa1d665e493148b4ff4d794492cc5318c63f75e478327842' 
  AND token = 'W/y9xzy8uZbU9937DuTIZVgNNKLp1pGvVTAlLIX5Alo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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