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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb756c6b99a4d733075a14fb205099b005e685c9745105863ab54973cacb59f4' 
  AND token = '1TR4tn27ZzIOX5Wgb0JMmYgBMpJtJcIN4xF3vyMer4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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