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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d2578ad2e03cc818fb75323f1f1f591903a305e65673fce85b2ae6285694b6e' 
  AND token = 'JKojancsnjLZdu8Jku7nWVVBF7C7HEaLDL7Z8Wx22Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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