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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b95f9b98654fc132e8da32448c83bed36f66ada27c0c76bae05b99d3cc13a3b' 
  AND token = 'NLbbPf3pAXeqN5oAWpElzxiPoL2dqtXT6u+uf+zUAUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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