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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8ba4f5c85e98c9bedd33530e5301604bcf6fa4573ee8cac92c23217619ce75b' 
  AND token = 'AeTjxSkg2f2r6kxXKrs8RaBc/DL59x9L6YCkVSlJM6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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