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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c7b30ea77fc16209092261fb0ee5c891f291ae74aaf11080dbda6fcad1a6032' 
  AND token = 'IPKeVwPL+i3cWCRfzTvMq2ZT55fOJDsLzFuh2RrT/Ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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