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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e409e4e42d37d3b3abfcd80c240737c18a72506b1dd314fe3430fcc8d8c2551c' 
  AND token = 'nczun3cgAsTHoB7exxPoX9MZdI6eHqykmIrtqjcUZ5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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