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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baba7118da55f6f820f132bc041c171665adb23e6d957e560152deab69a8d82d' 
  AND token = 'aTz3rEV16NWQ2yZXW0CfVGKKFRi8+8B7lM/c5C0t4zA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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