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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cdc90e88e98d39cf055af4febc8bcd35daad5f05b67022914b5f12bb84322f9' 
  AND token = 'llAeFnU8UjEnI5JlGpe2tRYZxm5f2g0Fr+NCd3KQ0aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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