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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd79d85287572566ad6d7b5ddefe7407622bb8c6f1df59de22e4e4de90a8624d0' 
  AND token = 'EqXe9/Agm8SXoqFoORTBZw8XPjv8K9G5F8kFWJRT2l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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