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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98d0230d8dff208670152c33e4e46b6e52b591d19ab49b2c5f8f2838a06b906b' 
  AND token = '6KCidHxfsginOOyTE8UYWJc7LasV3eaZV2JbhKx5HYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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