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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b069711ebea6bf833c42d5dcf0f438f354182e86b6dfdd2d7b8f448d1cb142c9' 
  AND token = '/Y2C4BTzNseQP976RH4yyaSb2buf0amvBA1HgFNlyvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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