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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff37205a7c739da8b0ee2bb4fc02eb47ec292e8b8ebbe28ceddf754ee3d90b9f' 
  AND token = 'kvNRjxLkMs/LZ9BfrprEJF5AuNZP0ovHYFL2LT4JlSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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