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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f8c28738a5cab6571f27cfa89c16c0deee618a8da3592f015842061662f989f' 
  AND token = 'SLoMHCuALpkRKBYtdnQ+EnxI6eJsiL+OjC6W3FyzLgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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