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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7a6f98e564a90316b620867359097c6525608995d752c7b7cd32a04e4eb07bc' 
  AND token = 'xdGF6pik67e6/7a4203nRW9GLrM978EkhuWomEO75ZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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