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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '754cc220711abb5cc5b13d10295bf89756227151f32c6d9b51443fe48cab5c9a' 
  AND token = 'Vlo0TGKTEtg7MvExABnmd5KoA2OjVMbZqhzKrXx6RRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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