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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4e2792984ea94bf1fa4b50a08d7a353307138179f7d533a1ae96d7e2c0381f8' 
  AND token = 'z7gTUfz3zrQcEfONPk69E0lrvkNz1AVmIsTi+Pc6PLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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