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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '532d427a83d9bb590560a50e41005fca5fea816fce628150a489a91c271c8722' 
  AND token = '631AQ4lB7xE/9HFmpmX1F39533/+pRNoiYt20KCEdl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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