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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '099675cdd958e0294cc2c7bf8c0fbc155c404b4532a4081feb2cb8626cf884e1' 
  AND token = '62X7UNFX2ArUelRR3H6iVqFXltYIneflVxDd/PYVIvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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