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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41e89c7f7d8ae0944f9c689f66acf9f526001a1d208547a9ac477fd6c52b3a90' 
  AND token = 'egDy5LY45g6J+BAhxu86RobsW96dm3q2tYV0LiOkMAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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