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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e43117127b1558e0e14082f627a393d390ebb90de767ef952b9490d9812d8c4' 
  AND token = '/rKuia0n9fw0frhXERYm2WWnTYYCTH9x988yk+DO4Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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