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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '174f51cc9a870a4478c72479b16435039750df8464f7c157c56d0bbbc71dd45b' 
  AND token = 'f+yQFwVyURqX3e8rEJ64rL6ntQQ/x7xyduZdpYxbiKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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