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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5426abdf19bd2fe8cc7aa25ab465eef7828822104dd4ab62490605ca6f9b31bb' 
  AND token = '2lGne6RgY/MMh4d7FF+MnWUsU9BNRJq5mX8s5c2OjhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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