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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f43d7a3c960dfefec278ca10998eb858ad59ba942eace4c3b6af5d838008736b' 
  AND token = '/M9h9dZ4vcgwBfnaEtvhFEBDd5gmLm10+IJmJr0HYog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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