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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db8cf19c63d79fa0c66c5f257dfd0810d64082f53672d5115e8ebca7d86717ea' 
  AND token = '/mma8vnc34ixBFNH4BaaABnA4TbT1A8cnT61Je0wSTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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