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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cae4a46b31c4242b6c44ca7b8cdc6b119d8b6193a50fd56edc3c71aa65e17ce9' 
  AND token = 'eRcvr3PjyMCdaIU2/18tkDi03X+WgoNHs2YxlyyP47I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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