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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df256d91dd1d6157755badbdd98a51107c32d7ef59e621416a9d3806efeb8749' 
  AND token = '1VCfVQQvmqzU1Iwh2ZgoYqzVMoW5pUaz1ZH0ouWAOZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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