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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5b50fa706576ed475ac482c845272f7d6b76c0e7a7df795ad97991d3dcc6db3' 
  AND token = 'M/yjZrf2BwAH6eBeGoS1aPSHmnWGCkpOzs/XnFdNOlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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