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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e73b883d8a087eb46363fd89989f37d2efe497d03a77fdd985cc0a7b63bb2dce' 
  AND token = 'ndvy9MX9ohucpYeKVur0oiw42OqlzhXvUioKWjqWftw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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