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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '243deb4b610de5fe94463639643ae6133872fba8560ec257cd1c847d62f6b73a' 
  AND token = 'IUxwLC26EUyQOEYQWigZ2tPSeqn5OkFr8jOK/KP/dbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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