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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5567de85badc12851d880ef37e171f59228aa8c3a7b4cc68f9de661a171e7eb8' 
  AND token = '7afG7M7gzgr50YDznqnAxkiLlT5Wm4TkLp2Dpgval1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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