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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5108c7579d253aae7fd3755683ffb70a0457a61e01004c3b9787aa5eca327f9d' 
  AND token = 'dRC4FmHbliKDjn39HZ4/de+YWPF95d5sY/xFAyp0eS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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