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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e582ee0c0c6236d6c971b920d278f81f8c39a288417f53f3a090d84a66685e5b' 
  AND token = 'iSfC7Um8rzwg3hHm5eOK1Xt0q7uZAInnHorRO8dIk14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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