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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e4b8847f70185ceaeedf3374940c9f5374906c14242ff93084ba024948eaecc' 
  AND token = 'YRaoPnBirWDvzZ4e2Fwl6ae0toZgxfobFf93uMl85ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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